compiler-rt/test/builtins/Unit/paritydi2_test.c

   1 // RUN: %clang_builtins %s %librt -o %t && %run %t
   2 // REQUIRES: librt_has_paritydi2
   3
   4 #include "int_lib.h"
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7
   8 // Returns: 1 if number of bits is odd else returns 0
   9
  10 COMPILER_RT_ABI int __paritydi2(di_int a);
  11
  12 int naive_parity(di_int a)
  13 {
  14     int r = 0;
  15     for (; a; a = a & (a - 1))
  16         r = ~r;
  17     return r & 1;
  18 }
  19
  20 int test__paritydi2(di_int a)
  21 {
  22     si_int x = __paritydi2(a);
  23     si_int expected = naive_parity(a);
  24     if (x != expected)
  25         printf("error in __paritydi2(0x%llX) = %d, expected %d\n",
  26                a, x, expected);
  27     return x != expected;
  28 }
  29
  30 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
  31 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
  32
  33 int main()
  34 {
  35     int i;
  36     for (i = 0; i < 10000; ++i)
  37         if (test__paritydi2(((di_int)rand() << 32) + rand()))
  38             return 1;
  39
  40    return 0;
  41 }